package com.blog.interceptor;


import com.blog.common.basecontext.BaseContext;
import com.blog.common.constant.JwtClaimsConstant;
import com.blog.common.exception.BaseException;
import com.blog.entity.User;
import com.blog.mapper.UserMapper;
import com.blog.properties.JwtProperties;
import com.blog.service.IUserService;
import com.blog.utils.JwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * jwt令牌校验的拦截器
 */
@Component
@Slf4j
public class JwtTokenInterceptor implements HandlerInterceptor {

    @Autowired
    private JwtProperties jwtProperties;

    @Autowired
    private IUserService userService;

    /**
     * 校验jwt
     *
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
//        log.info("拦截器开始工作...");
        //判断当前拦截到的是Controller的方法还是其他资源
        if (!(handler instanceof HandlerMethod)) {
            //当前拦截到的不是动态方法，直接放行
            return true;
        }
        //为注册时，放行
        if (request.getRequestURI().contains("/register")) {
            return true;
        }
        //1、从请求头中获取令牌
        String token = request.getHeader(jwtProperties.getTokenName());
        if (token == null || token.isEmpty()){
            response.setStatus(401);
            return false;
        }
        //2、校验令牌
        try {
            log.info("jwt校验:{}", token);
            Claims claims = JwtUtil.parseJWT(jwtProperties.getSecretKey(), token);
            Long id = Long.valueOf(claims.get(JwtClaimsConstant.ID).toString());
            //根据id获得用户信息
            User user = userService.getById(id);
            if (user == null){
                throw new BaseException("用户不存在");
            }
//            if (user.getStatus() == 0){
//                throw new BaseException("账号已被禁用，请联系管理员");
//            }
            BaseContext.setCurrentId(id);
//            log.info("当前登录用户id：{}", id);
            //3、通过，放行
            return true;
        } catch (Exception ex) {
            //4、不通过，响应401状态码
            response.setStatus(401);
            throw new BaseException("令牌无效");
        }

    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        BaseContext.remove();
    }
}
